橢圓周長計算- Yahoo!奇摩知識+

橢圓周長=3.14*[1.5*(長軸距+短軸距)-(長軸距*短軸距)ˇ1/2] =3.14*[1.5*(66+54)-√( 66*54)] =3.14*(180-59.7) ...

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